HP 8590 E & L Series Spectrum Analyzers and HP 8591C Cable TV ...

Description
MKD Marker Delta
The MKD command computes the frequency and amplitude difference of the active marker
and a special marker, called the delta or differential marker. These values are displayed in the
display readout.
The differential value of the frequency is equal to the active marker frequency minus the
delta marker frequency. The differential value of the amplitude is equal to the active marker
amplitude minus the delta marker amplitude.
If an active marker is not on the screen, MKD positions an active marker at center screen. If a
delta marker is not on the screen, MKD places one at the specified frequency, or at the current
active marker. If the active marker is in amplitude mode, the delta marker is placed at the
same amplitude as the active marker (or a specified value).
To read the amplitude, use MKA?. ‘lb read the frequency, use MKF? The results are displayed
on the spectrum analyzer screen.
In linear mode, MKD computes the ratio of the amplitudes of the active and delta markers
rather than the difference. This results in similar treatment for logarithmic and linear data
because the delta of the difference of two logarithmically generated numbers results in the
logarithmically generated value of the ratio of the two numbers. (You should not change
amplitude units when making a marker delta measurement, however.)
Programming Commands 5-333